Banquet Hall Reopening: Occupant Load Versus What the Stairs Actually Deliver
The second floor of a converted 1970s department store is now a banquet hall with no automatic sprinkler system. The 4,800 ft² floor is laid out as 3,300 ft² of round tables and chairs, a 600 ft² dance floor, a 700 ft² bar and lounge with high-top tables plus standing room, and a 200 ft² service corridor to the kitchen. Two exits serve the hall: a 36 in. door into an enclosed interior stair, and a 36 in. door onto an open steel balcony stair. Both doors swing in the direction of egress travel and have panic hardware. A third door from the kitchen leads to a service corridor and the loading dock, and staff use it constantly. The owner has posted an occupant load of 300 and has sold 420 tickets for Saturday's dinner-dance. There is one crowd manager on staff, one illuminated exit sign over the front door, and battery-operated smoke alarms on the ceiling.
1. Compute the occupant load and the egress capacity the two exits actually provide. State whether the posted 300 and the 420-ticket event are supportable, and identify the component that controls the answer.
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Occupant load. Use the assembly factors from the occupant load table: 15 ft² per person (net) for tables and chairs, 5 ft² per person (net) for standing space.
- Seating: 3,300 ÷ 15 = 220
- Dance floor (occupied by standing patrons, so it is not deducted): 600 ÷ 5 = 120
- Bar/lounge standing and high-tops: 700 ÷ 5 = 140
- Total = 480 persons
The service corridor and kitchen are not public assembly area, so they are not added to this calculation (they are also not counted as exits).
Provided capacity. The trap is to stop at the doors: 72 in. of door ÷ 0.2 in. per person = 360 persons. But capacity is limited by the narrowest egress component in each path. Each exit includes a 36 in. stair, and stairs are computed at 0.3 in. per person: 36 ÷ 0.3 = 120 persons per stair.
- Enclosed stair exit: 120
- Balcony stair exit: 120
- Effective total = 240 persons
Conclusion. The calculated load is 480, the building can legally egress about 240, and the owner has posted 300 - a number the exits cannot support. Neither the 300 posting nor the 420-ticket event is supportable. The controlling element is stair width, not door width; a 36 in. door feeding a 36 in. stair delivers stair capacity, not door capacity.
2. If the stairs cannot be widened before Saturday, what is the largest defensible attendance, and what conditions should the AHJ attach to any approval?
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Maximum attendance: roughly 240, set by the two 36 in. stairs, not by the seating layout or the owner's posting. Since the calculated 480 cannot be supported, the AHJ should require the layout to be reduced and physically controlled so the space cannot be re-arranged back to 480 the moment the inspector leaves.
Conditions worth attaching:
- A sealed layout plan showing table count, chair count, dance floor limits and bar standing area, with a fresh occupant load calculation that matches the posted number. Re-post the sign at 240 and remove the 300 placard.
- Crowd managers at one per 250 occupants - one is the arithmetic minimum at 240, but two is defensible given the two exits and the bar. They must be identifiable, trained on the egress plan and empowered to stop admissions.
- Exit maintenance: both stairs clear of storage, handrails intact, panic hardware functioning, doors unlocking from the inside without a key, and exit signs plus emergency lighting at both exits (currently only one sign exists).
- Ticket control tied to the posted number, with staff counting at the door.
- No substitution by fire watch. A fire watch addresses an impaired detection or suppression system; it does not create egress width. Suggesting a watch in lieu of capacity is a misapplication of the concept.
A re-inspection before opening, plus a written approval that expires if the layout changes, converts the calculation into something enforceable.
3. The owner proposes cutting a new 36 in. door from the dance floor, through the kitchen, into the service corridor to gain a third exit before Saturday. Evaluate that proposal.
Read the worked answer
As proposed, no. Two independent problems:
- The path runs through a hazardous area. A commercial kitchen with cooking equipment is a hazardous area, and exit access generally may not pass through a hazardous area. A door that puts departing patrons into the middle of a working kitchen - hot surfaces, grease, cooks moving with pans - is not a compliant or safe egress path, regardless of door width.
- The corridor may not lead anywhere usable. It terminates at a loading dock. Exit access must be continuous to a public way or an approved discharge point, so the corridor would have to be evaluated as an exit enclosure with its own construction, lighting, signage and capacity.
What would have to be true for it to count: the path would have to be separated from the cooking operation (a rated corridor independent of the kitchen, or a kitchen with no hazardous cooking equipment), enclosed and continuous to the exterior at grade, provided with doors that swing in the direction of travel with panic hardware, illuminated with exit signs and emergency lighting, and sized for its share of the 480 occupants.
That involves plan review and construction, not a weekend cut. The realistic short-term options remain: reduce attendance to the 240 the existing stairs support, or post a reduced load tied to a controlled layout.